I saw this in an email message.

Problem:
A comma is missing.

Explanation:
Without the comma, this sentence is structured such that the writer is thanking the reader for sharing Jim.

What the writer wanted to do was thank Jim for sharing (the information contained elsewhere in the email message).

Commas provide the pauses that let readers “hear” where writers are taking breaks in speech.

The writer of the sentence in the email message was pausing before saying in her mind the name Jim, but she failed to put in her sentence a comma that would indicate the location of that pause.

Solution:
“Thanks so much for sharing, Jim.”